Do You Need a Pre-Op Physical Before Cataract Surgery?

For the vast majority of people, a routine pre-operative physical and battery of lab tests before cataract surgery does not improve safety or reduce complications. A Cochrane review covering more than 21,000 cataract surgeries found that the rate of adverse events was essentially identical whether patients underwent routine preoperative medical testing or skipped it entirely.¹ Yet many surgical centers and eye clinics still send patients to their primary care doctor for a clearance visit, creating confusion about what is actually required.

What the Research Actually Shows

The strongest evidence on this question comes from a landmark randomized trial published in the New England Journal of Medicine. Researchers assigned nearly 20,000 cataract surgeries either to a routine testing group (blood work, electrocardiograms, and other standard tests) or to a no-testing group. The overall complication rate was the same in both arms, at about 31 events per 1,000 operations. Breakdowns by age, sex, race, and pre-existing health conditions all told the same story: routine testing did not make the surgery any safer.²

A later Cochrane systematic review pooled that trial with two additional randomized studies, bringing the total to over 21,500 surgeries. The odds of a medical adverse event were statistically identical between the tested and untested groups. Most of the adverse events that did occur were cardiovascular and happened during the operation itself, regardless of whether tests had been done beforehand. The review also found no difference in surgery cancellation rates between the two groups.¹ In other words, running a bunch of tests in advance does not catch problems that would otherwise derail the surgery.

A more recent study published in JAMA Ophthalmology tested a risk-based approach, where only patients flagged as higher risk got a pre-operative workup while the rest went straight to surgery. There was no difference between the two groups in intraoperative complications, emergency department visits within seven days, or hospital admissions. The group that received routine pre-op evaluations actually had more case delays, presumably because abnormal findings on unnecessary tests triggered follow-up appointments that postponed the procedure.³

Why Your Surgeon’s Office Might Still Require One

If the evidence is so clear, you might wonder why you were told to schedule a physical. Part of the answer is institutional inertia. For years, the Centers for Medicare and Medicaid Services (CMS) required that a history and physical exam be completed within 30 days of any surgery performed in an ambulatory surgery center. In late 2019, CMS dropped that blanket requirement, instead deferring to each facility’s own policy and the operating physician’s clinical judgment.⁴ The idea was to let doctors tailor pre-surgical assessments to the patient and the type of procedure rather than mandate the same routine for every case.

The problem is that many ambulatory surgery centers never updated their internal policies after CMS changed the rules. Some facilities still require every patient to show up with a signed clearance form. Individual ophthalmologists may request it out of habit, or because the anesthesia team at their surgery center demands it. The result is a disconnect: guidelines and evidence say routine pre-op testing is unnecessary for cataract surgery, but the form your scheduler hands you says otherwise. If you are told you need a physical, it is worth asking whether that is a regulatory requirement or a facility preference, because the answer is almost always the latter.

The Frustration on the Primary Care Side

This gap between evidence and practice is not just confusing for patients. Primary care providers have described the volume of pre-op assessment referrals for cataract surgery as a significant source of frustration. A qualitative study found that providers felt the assessments were medically unnecessary, consumed limited appointment time, and burdened patients with an extra visit that added no safety benefit. Many were unaware that CMS had already removed the 30-day history-and-physical requirement, which only compounded the problem: they continued to perform the exams because they assumed a regulation still mandated them.⁴

This matters for your access to care. Every pre-op clearance visit that did not need to happen is a primary care appointment that someone else could have used. In areas with doctor shortages, which is most of the country, the cumulative effect of thousands of unnecessary pre-op visits is not trivial. It can also delay your surgery by days or weeks while you wait for an available appointment with your primary care provider.

When a Pre-Op Evaluation Actually Helps

None of this means every patient should skip a medical assessment before cataract surgery. The point the research makes is about routine blanket testing for all comers, not about targeted evaluation for people who genuinely need it. There are real situations where a pre-operative conversation between your eye surgeon and your primary care doctor is worthwhile:

Complex procedures: When the surgery is expected to be longer or more difficult than usual, such as cases involving a very dense cataract, a small pupil, or weakened lens-support structures, the surgeon may need a stronger anesthetic than the standard numbing eye drops. Techniques like retrobulbar or peribulbar nerve blocks carry slightly more systemic risk, and knowing your full medical picture helps the team plan safely.
Possible conversion to general anesthesia: In rare cases, a patient may need to be put under during cataract surgery. People with significant airway compromise or severe anxiety disorders benefit from a pre-op assessment that identifies those risks early.
Frail or medically unstable patients: For elderly patients with frailty or poorly controlled chronic conditions, a pre-op assessment can help the patient and surgeon decide whether to optimize those conditions first or whether the benefit of improved vision outweighs the small procedural risks.⁴
Recent hospitalization: One large study of nearly 65,000 cataract surgery patients found that those who had been hospitalized in the 30 days before their procedure had dramatically higher odds of being hospitalized again within a week of surgery.⁵ For someone recovering from a recent medical event, a targeted pre-op assessment makes obvious sense.

The distinction is between blanket screening, which helps no one, and selective evaluation for people with genuine red flags. Most patients getting cataract surgery are older adults with at least one or two chronic conditions like high blood pressure or diabetes. The evidence says those common conditions alone do not warrant extra testing. It is the combination of complexity and instability that changes the calculus.

Blood Thinners and Medication Questions

One of the most common worries patients bring to a pre-op visit is whether they need to stop blood thinners before surgery. For cataract surgery specifically, the answer is generally no. A study comparing patients who stopped anticoagulants and antiplatelet drugs a week before surgery to those who continued taking them found no significant difference in intraoperative or postoperative complications, and no difference in visual outcomes. The group that stayed on their medications did have a higher rate of subconjunctival hemorrhage, which is a red spot on the white of the eye, but this is cosmetic and resolves on its own.⁶

Stopping blood thinners carries its own risks, including stroke and blood clots, which are far more dangerous than a bruise on the eye. Most ophthalmologists now prefer patients to continue their anticoagulation regimen through cataract surgery. This is one area where a quick phone call between your eye surgeon and your prescribing doctor can resolve the question without a full office visit. If you are on warfarin, aspirin, or one of the newer blood thinners, ask your ophthalmologist directly rather than assuming you need a separate clearance appointment to sort it out.

What Happens in the Operating Room

Part of the reason routine pre-op testing adds so little is that cataract surgery already has safety monitoring built in. During the procedure, your pulse, blood pressure, oxygen levels, and heart rhythm are tracked continuously.⁷ If something goes wrong, the team sees it in real time and can respond immediately. An EKG done two weeks earlier in your primary care doctor’s office gives a snapshot of that moment, not of what is happening during surgery.

Most cataract procedures are done with topical anesthesia, meaning numbing drops on the eye, sometimes with a mild sedative through an IV. This approach avoids the systemic risks of general anesthesia almost entirely. Blood pressure can fluctuate during the procedure, particularly in patients with hypertension, but mild IV sedation tends to reduce those swings substantially.⁸ The entire operation typically takes 15 to 30 minutes. The low-risk, short-duration nature of the procedure is precisely why the evidence for routine pre-op testing is so weak: there just is not much for those tests to prevent.

The Cost of Testing That Does Not Help

Unnecessary pre-op testing is not free, even when it does not change anything clinically. A study within the Veterans Health Administration found that roughly half of all cataract operations were preceded by at least one low-value preoperative test. Across all VA facilities in a single fiscal year, those tests cost about $2.6 million. The most commonly ordered tests were electrocardiograms, complete blood counts, and basic metabolic panels, but about one in eight patients also received more expensive tests like chest X-rays and pulmonary function tests.⁹

That $2.6 million figure is just one health system in one year. Cataract surgery is the most commonly performed operation in the United States, with several million procedures annually. Scale those unnecessary tests across Medicare, private insurance, and other systems, and the waste adds up fast. The Cochrane review noted that pre-op testing was estimated to cost about two and a half times more than no testing in one of the included studies.¹ For individual patients, the costs include co-pays for extra visits, time off work or arranging transportation, and the anxiety of getting test results you did not need.

There is also a subtler cost. Abnormal findings on unnecessary tests can trigger a diagnostic cascade: an incidental blip on an EKG leads to a stress test, which leads to a cardiology referral, which delays the surgery by weeks or months. Meanwhile, the patient’s vision continues to deteriorate. The JAMA Ophthalmology study found that patients in the routine pre-op group experienced significantly more case delays than those in the risk-based group.³ Getting tested “just in case” sounds cautious, but it can backfire.

Does Skipping the Pre-Op Visit Make Patients More Anxious?

Some patients worry that going into surgery without a physical will leave them feeling unprepared. A Canadian study measured anxiety levels in patients who attended a preoperative clinic versus those who bypassed it and found no significant difference between the two groups.¹⁰ What seems to matter more for patient comfort is having a clear understanding of what will happen during the procedure, what to expect on the day, and when to call if something feels wrong afterward. That kind of preparation can come from the ophthalmologist’s office directly and does not require a separate medical visit.

Who Is at Higher Risk After the Surgery

While the surgery itself is very safe, what happens in the days and weeks afterward varies by patient. Among nearly 65,000 cataract surgery patients in one managed-care population, only about 0.3% were hospitalized within seven days, 1.3% within 30 days, and 4.2% within 90 days. For patients with no major pre-existing conditions, the seven-day hospitalization rate dropped to just 0.1%. Each additional chronic condition a patient had increased the odds of post-surgical hospitalization by about a third, and each prior hospitalization in the preceding three years raised the odds by about 14%.⁵

These numbers reinforce the case for selective rather than blanket pre-op screening. The patients who end up in the hospital after cataract surgery are overwhelmingly those who were already medically complex. Their doctors generally know they are complex. A routine pre-op physical is not what identifies them; their medical history does. The practical takeaway is that if you have several serious health conditions or were recently hospitalized, a conversation with your surgeon about timing and readiness makes sense. If you are in reasonably stable health, the numbers say you are at very low risk.

Cataract Surgery and Dementia

One population that faces unique barriers to cataract surgery is people with dementia. A large study found that patients with dementia were about 47% less likely to undergo cataract surgery than their peers without cognitive decline, even after adjusting for other health differences. Those who did have the first eye done were also less likely to proceed to surgery on the second eye.¹¹

This matters because poor vision in people with dementia is linked to faster functional decline, increased falls, and worse quality of life. Adding a mandatory pre-op physical on top of the challenges that dementia patients and their caregivers already face, including difficulty with transportation, communication barriers during medical visits, and the cognitive load of navigating multiple appointments, creates one more obstacle. For this population, streamlining the surgical pathway by eliminating unnecessary pre-op visits could meaningfully improve access to a procedure that has real benefits for daily functioning and safety.

1
PubMed Central. Routine preoperative medical testing for cataract surgery
2
PubMed. The value of routine preoperative medical testing before cataract surgery
3
JAMA Ophthalmology. Feasibility of a Risk-Based Approach to Cataract Surgery Preoperative Medical Evaluation
4
PubMed Central. Routine preoperative assessment for cataract surgery is a source of frustration for primary care providers
5
PubMed Central. Hospitalization after Cataract Surgery in a Nationwide Managed-Care Population
6
PubMed. Evaluation of the need to discontinue antiplatelet and anticoagulant medications before cataract surgery
7
PubMed Central. Intraoperative alteration in the vital signs of diabetic patients during cataract surgery with local anesthesia
8
PubMed Central. Effect of intravenous sedation on patients’ visual experience and vital signs during cataract surgery under topical anesthesia: A randomized controlled trial
9
JAMA Network Open. Variability and Costs of Low-Value Preoperative Testing for Cataract Surgery Within the Veterans Health Administration
10
PubMed. Evaluating patient preparedness for cataract surgery and satisfaction with preoperative care
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PubMed Central. Differences in Cataract Surgery Rates Based on Dementia Status